Roof: Don't fix what's not broken?

Ranch house, 1200 sq feet. Attic's loaded with pink batts. Roof's got 4
vents evenly spaced across the back of the house. No ice damming, not even a
hint of it. In summer, even if it's 90+ outside, the AC runs maybe two hours
while the sun's up, probably due (I assume) to three trees that provide
shade in exactly the right places between sunrise & sunset.
Three roofers are suggesting a ridge vent and soffit vents. I'd rather
conserve funds at the moment. Even though these accessories don't add a lot
to the price, whattya think about leaving well enough alone?

more venting is always better, in cold winter temps it minimizes
condensation in and on the pink fiberglass batts, in the summer it
helps keep things cooler which leads to much longer roof life. plus
these are cheap additions.
how much extra for the added venting?

Depending on which roofer, $350-$400 on top of an average estimate of $5000
(for just a tear-off and top of the line shingles). All estimates also
include a vent specific to the bathroom fan. Previous owner did a cob job,
attaching the duct to the inside of a normal vent.

Upstate NY. Winter: 68 while awake, 62-64 at night. Summer: 72-75 daytime,
rarely used at night, AC only used if the temp's over 78-ish. Due to nice
prevailing breezes, I never seem to need it below that temp.

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